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1. May 2004 Copyright 2004 Komatsu
Printed in USA DataKom Publishing Division
00-1 2
CEBM012502
Shop
Manual
PC400LC-7L
HYDRAULIC EXCAVATOR
This material is proprietary to Komatsu America Corp. and is not to be reproduced, used, or disclosed except in accordance
with written authorization from Komatsu America Corp.
It is our policy to improve our products whenever it is possible and practical to do so. We reserve the right to make changes or
add improvements at any time without incurring any obligation to install such changes on products sold previously.
Due to this continuous program of research and development, periodic revisions may be made to this publication. It is
recommended that customers contact their distributor for information on the latest revision.
SERIAL NUMBERS PC400LC-7L A86001 and UP
PC400LC-7L

2. FOREWORD CONTENTS
00-2 2 PC400LC-7L
12
CONTENTS 00
01 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01-1
10 STRUCTURE, FUNCTION AND MAINTENANCE STANDARD . . . . . . . . . . . . . . . . . . . . 10-1
20 TESTING, ADJUSTING AND TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-1
30 DISASSEMBLY AND ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30-1
90 OTHER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90-1

3. FOREWORD SAFETY
PC400LC-7L 00-3
12
SAFETY 00
SAFETY NOTICE 00
GENERAL PRECAUTIONS 00
Mistakes in operation are extremely dangerous. Read the OPERATION & MAINTENANCE MANUAL carefully BEFORE
operating the machine.
1. Before carrying out any greasing or repairs, read all the precautions given on the decals which are fixed to the machine.
2. When carrying out any operation, always wear safety shoes and helmet. Do not wear loose work clothes, or clothes with
buttons missing.
● Always wear safety glasses when hitting parts with a hammer.
● Always wear safety glasses when grinding parts with a grinder, etc.
3. If welding repairs are needed, always have a trained, experienced welder carry out the work. When carrying out welding
work, always wear welding gloves, apron, glasses, cap and other clothes suited for welding work.
4. When carrying out any operation with two or more workers, always agree on the operating procedure before starting.
Always inform your fellow workers before starting any step of the operation. Before starting work, hang UNDER
REPAIR signs on the controls in the operator's compartment.
5. Keep all tools in good condition and learn the correct way to use them.
6. Decide a place in the repair workshop to keep tools and removed parts. Always keep the tools and parts in their correct
places. Always keep the work area clean and make sure that there is no dirt or oil on the floor. Smoke only in the areas
provided for smoking. Never smoke while working.
PREPARATIONS FOR WORK 00
1. Before adding oil or making repairs, park the machine on hard, level ground, and block the wheels or tracks to prevent the
machine from moving.
2. Before starting work, lower blade, ripper, bucket or any other work equipment to the ground. If this is not
possible, insert the safety pin or use blocks to prevent the work equipment from falling. In addition, be sure to lock all the
control levers and hang warning signs on them.
3. When disassembling or assembling, support the machine with blocks, jacks or stands before starting work.
IMPORTANT SAFETY NOTICE 00
Proper service and repair is extremely important for the safe operation of your machine. The service and repair techniques
recommended and described in this manual are both effective and safe methods of operation. Some of these operations
require the use of tools specially designed for the purpose.
To prevent injury to workers, the symbols and are used to mark safety precautions in this manual. The cautions
accompanying these symbols should always be followed carefully. If any dangerous situation arises or may possibly arise,
first consider safety, and take the necessary actions to deal with the situation.

4. FOREWORD SAFETY
00-4 PC400LC-7L
4. Remove all mud and oil from the steps or other places used to get on and off the machine. Always use the handrails, lad-
ders or steps when getting on or off the machine. Never jump on or off the machine. If it is impossible to use the handrails,
ladders or steps, use a stand to provide safe footing.
PRECAUTIONS DURING WORK 00
1. When removing the oil filler cap, drain plug or
hydraulic pressure measuring plugs, loosen them slowly to prevent the oil from spurting out. Before
disconnecting or removing components of the oil, water or air circuits, first remove the pressure completely from the cir-
cuit.
2. The water and oil in the circuits are hot when the engine is stopped, so be careful not to get burned. Wait for the oil and
water to cool before carrying out any work on the oil or water circuits.
3. Before starting work, remove the leads from the battery. ALWAYS remove the lead from the negative (-)
terminal first.
4. When raising heavy components, use a hoist or crane. Check that the wire rope, chains and hooks are free from damage.
Always use lifting equipment which has ample capacity. Install the lifting equipment at the correct places. Use a hoist or
crane and operate slowly to prevent the component from hitting any other part. Do not work with any part still raised by
the hoist or crane.
5. When removing covers which are under internal pressure or under pressure from a spring, always leave two bolts in
position on opposite sides. Slowly release the pressure, then slowly loosen the bolts to remove.
6. When removing components, be careful not to break or damage the wiring, Damaged wiring may cause electrical fires.
7. When removing piping, stop the fuel or oil from spilling out. If any fuel or oil drips on to the floor, wipe it up immediately.
Fuel or oil on the floor can cause you to slip, or can even start fires.
8. As a general rule, do not use gasoline to wash parts. In particular, use only the minimum of gasoline when washing
electrical parts.
9. Be sure to assemble all parts again in their original places. Replace any damaged part with new parts.
• When installing hoses and wires, be sure that they will not be damaged by contact with other parts when the machine
is being operated.
10. When installing high pressure hoses, make sure that they are not twisted. Damaged tubes are dangerous, so be extremely
careful when installing tubes for high pressure circuits. Also check that connecting parts are correctly installed.
11. When assembling or installing parts, always use the specified tightening torques. When installing protective parts such as
guards, or parts which vibrate violently or rotate at high speed, be particularly careful to check that they are installed
correctly.
12. When aligning two holes, never insert your fingers or hand. Be careful not to get your fingers caught in a hole.
13. When measuring hydraulic pressure, check that the measuring tool is correctly assembled before taking any
measurements.
14. Take care when removing or installing the tracks of track-type machines. When removing the track, the track separates
suddenly, so never let anyone stand at either end of the track.

5. FOREWORD GENERAL
PC400LC-7L 00-5
12
GENERAL 00
This shop manual has been prepared as an aid to improve the quality of repairs by giving the serviceman an accurate
understanding of the product and by showing him the correct way to perform repairs and make judgements. Make sure you
understand the contents of this manual and use it to full effect at every opportunity.
This shop manual mainly contains the necessary technical information for operations performed in a service workshop. For
ease of understanding, the manual is divided into the following sections. These sections are further divided into each main
group of components.
GENERAL
This section lists the general machine dimensions, performance specifications, component weights, and fuel, coolant and
lubricant specification charts.
STRUCTURE AND FUNCTION
This section explains the structure and function of each component. It serves not only to give an understanding of the
structure, but also serves as reference material for troubleshooting.
TESTING, ADJUSTING AND TROUBLESHOOTING
This section explains checks to be made before and after performing repairs, as well as adjustments to be made at
completion of the checks and repairs. Troubleshooting charts correlating “Problems” to “Causes” are also included in this
section.
DISASSEMBLY AND ASSEMBLY
This section explains the order to be followed when removing, installing, disassembling or assembling each component,
as well as precautions to be taken for these operations.
MAINTENANCE STANDARD
This section gives the judgement standards when inspecting disassembled parts.
NOTICE
The specifications contained in this shop manual are subject to change at any time and without any advance notice. Contact
your distributor for the latest information.

6. 01 GENERAL
01-1
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01-2
WEIGHT TABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01-7
FUEL COOLANT AND LUBRICANTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01-9
PC400LC-7L

7. GENERAL SPECIFICATIONS
01-2 PC400LC-7L
12
SPECIFICATIONS
Item Unit PC400LC-7L
Operating weight
(Variable gauge specification)
kg
(lb)
44,600
(98,343)
Operating weight
(Fixed gauge specification)
43,700
(96,359)
Operating weight
43,700
(96,359)
Bucket capacity
m3
(cu.yd)
1.9
(2.5)
Name of engine - KOMATSU SAA6D125E-3 diesel engine
Rated horsepower of engine
kW
(HP)/rpm
246(330)
/1,850
A Overall length
mm
(ft in)
12,040
(39' 6“)
B Overall height
mm
(ft in)
3,670
(12')
C
Overall width
(Variable gauge specification) mm
(ft in)
3,690
(12' 1.2“)
C
Overall width
(Fixed gauge specification)
3,640
(11' 11.3“)
D Track shoe width (Variable gauge)
mm
(ft in)
800
(2' 7.5“)
D Track shoe width (Fixed gauge)
mm
(ft in)
900
(2' 11.4“)
E Height of cab
mm
(ft in)
3,250
(10' 8“)
F Radius of upper structure
mm
(ft in)
3,645
(11' 12“)
G Overall length of track
mm
(ft in)
5,355
(17’ 7“)
H Length of track on ground
mm
(ft in)
4,350
(14' 3“)
Min. ground clearance
mm
(ft in)
685
(2' 3“)
Traveling speed (low/middle/high)
km/h
(MPH)
3.0/4.4/5.5
(1.9/2.7/3.4)
Swing speed rpm 9.1
Tg Track gage
F/G
V/G
2740
2890
Tg (for transport)
F/G
V/G
---
2392

8. GENERAL SPECIFICATIONS
01-3 PC400LC-7L
12● “Variable gauge specification” means the machine can extend and retract overall width (C) of the track frame.
“Fixed gauge specification” means the machine cannot extend or retract overall width (C) of the track frame.

9. GENERAL SPECIFICATIONS
01-4 PC400LC-7L
12
Working ranges Unit PC400LC-7
A Max. digging reach
mm
(ft in)
12,030
(39' 6“)
B Max. digging depth
mm
(ft in)
7,830
(25' 8“)
C Max. digging height
mm
(ft in)
10,930
(35' 10“)
D Max. vertical wall digging depth
mm
(ft in)
6,870
(22' 6“)
E Max. dumping height
mm
(ft in)
7,625
(25')
F Min. dump height
mm
(ft in)
-
G Max. digging reached at ground level
mm
(ft in)
11,820
(38' 9“)

10. GENERAL SPECIFICATIONS
PC400LC-7L 01-5
12
★ The "Mi" mode is on the multi-monitor specification machine only.
Machine model PC400LC-7L
Serial Number A86001 and UP
Bucket capacity
m3
yd3
1.4
1.83
Fixed gauge spec. Variable gauge spec.
Weight of machine
kg
lb
43,700
96,342
44,600
98,326
Performance
Max. digging force
(using power max. function)
Swing speed
Swing max. slope angle
Travel speed
Gradeability
kgf (lbf)
kgf (lbf)
rpm
deg.
km/h (mi/h)
deg.
26,100 (57,541)
28,000 (61,729)
9.1
20
Lo: 3.0 (0.00186), Mi: 4.4 (0.00273),
Hi: 5.5 (0.00341)
35
Ground pressure
(standard shoe width)
kg/cm2 (lbf/ft2)
mm (in)
0.82 (11.66)
900 (35.4)
0.67 (9.52)
800 (31.5)
Dimensions
Overall length (for transport)
Overall width
Overall width of track (for transport)
Overall width of track when extended
Overall height (for transport)
Overall height to top of machine
Ground clearance of upper structure
Min. ground clearance
Tail swing radius
Min. swing radius of work equipment
Height of work equipment at min. swing radius
Length of track on ground
Track gauge (Tg)
Track gauge (for transport)
Height of machine cab
mm (ft in)
12,040 (39’ 6")
3,640 (11’ 11")
---
---
3,635 (11’ 11")
3,265 (10’ 9")
1,320 (4’ 4")
555 (1’ 10")
3,645 (12’ 0")
4,735 (15’ 6")
9,210 (30’ 3")
4,020 (13’ 2")
2,740 (9’ 0’)
---
3,265 (10’ 9")
12,040 (39’ 6")
3,690 (12’ 1")
3,192 (10’ 6")
3,690 (12’ 1")
3,635 (11’ 11")
3,265 (10’ 9")
1,320 (4’ 4")
685 (2’ 3")
3,645 (12’ 0")
4,735 (15’ 6")
9,210 (30’ 3")
4,020 (13’ 2")
2,890 (9’ 6")
2,392 (7’ 10")
3,265 (10’ 9")
Engine
Model
Type
No. of cylinders - bore x stroke
Piston displacement
mm (in)
L (in3
)
SAA6D125E-3
4-cycle, water-cooled, in-line, vertical, direct
injection, with turbocharger and aftercooler
6 - 125x150 (6 - 4.921x5.905)
11.045 (674.007)
Performance
Flywheel horsepower
Max. torque
Max. speed at no load
Min. speed at no load
Min. fuel consumption
kW/rpm (HP/rpm)
kgm/rpm (lbf ft/rpm)
rpm
rpm
g/kWh (g/HPh)
246.4/1,850 (330/1,850)
136/1,400 (983.9/rpm)
1,930
1,000
203 (151)
Starting motor
Alternator
Battery
24 V, 11 Kw
24 V, 50 A
12 V, 110 Ahx2
Radiator core type ALW-4

11. GENERAL SPECIFICATIONS
01-6 PC400LC-7L
12
Undercarriage
Carrier roller 2 on each side
Track roller 8 on each side
Track shoe Assembly-type triple grouser, 49 on each side
Hydraulicsystem
Hydraulicpump
Type x No.
Delivery
Set pressure
L/min (in3)
kgf/cm2
(lbf/in2
)
HPV190+190, variable displacement, piston type x2
345x2 (21053.2)
380 (5404.87)
Controlvalve
Type x No.
Control method
6-spool type + 1-spool type x 1
Hydraulic
Hydraulicmotor
Travel motor
Swing motor
KMV200ADT-2, Variable displacement, piston type (with
brake valve, parking brake): x 2
KMF230ABE-5, Fixed displacement piston type (with safety
valve, holding brake, reverse rotation
preventive valve): x 1
Hydrauliccylinder
Boom Arm Bucket
Type Double-acting piston
Inside diameter of cylinder
Diameter of piston rod
Stroke
Max. distance between pins
Min. distance between pins
mm (ft in)
160 (0’ 6")
110 (0’ 4")
1,570 (5’ 2")
3,830 (12’ 7")
2,260 (7’ 5")
185 (0’ 7")
120 (0’ 5")
1,820 (6’ 0")
4,325 (14’ 2")
2,505 (8’ 3")
160 (0’ 6")
110 (0’ 4")
1,270 (4’ 2")
3,140 (10’ 4")
1,870 (6’ 2")
Hydraulic tank
Hydraulic filter
Hydraulic cooler
Closed box type
Tank return side
CF40-1 (Air cooled)

12. GENERAL WEIGHT TABLE
PC400LC-7L 01-7
12
WEIGHT TABLE
Unit: kg (lb)
WARNING! This weight table is for use when handling components or when transporting the machine
Engine assembly
● Engine
● Damper
● Hydraulic pump
1,500 (3,307)
1,150 (2,535)
14.7 (32)
210 (463)
Radiator, oil cooler assembly 195 (430)
Hydraulic tank, filter assembly (excluding hydraulic oil) 198 (437)
Fuel tank (excluding fuel) 251 (554)
Revolving frame 3,297 (7,269)
Operator’s cab 279 (616)
Operator’s seat 35 (78)
Counterweight 9,500 (20,944)
Swing machinery (including swing motor) 526 (1,160)
Control valve (with service valve0 257 (567)
Swing motor 105 (232)
Travel motor 208 (459) x 2
Center swivel joint 40 (89)
Fixed gauge specification Variable gauge specification
Track frame assembly
Track frame
● Center frame
● Crawler frame
10,965 (24,174)
6,077 (13,398)
---
---
11,934 (26,310)
7,096 (15,644)
3,229 (7,119)
1,921 (4,235) x 2
Swing circle
Idler
Idler cushion
Carrier roller
Track roller
Final drive (including travel motor)
605 (1,334) x 2
230 (507) x 2
338 (745) x 2
32 (71) x 4
72 (159) x 16
722 (1,592) x 2
Track shoe assembly
● Standard triple grouser shoe (600 mm)
● Standard triple grouser shoe (700 mm)
● Wide triple grouser shoe (800 mm)
● Wide triple grouser shoe (900 mm)
4,760 (10,494)
5,210 (11,486)
5,670 (12,500)
6,130 (13,515)
Boom assembly 3,290 (7,254)
Arm assembly 1,374 (3,030)
Bucket assembly 1,366 (3,012)
Boom cylinder assembly 355 (783) x 2
Arm cylinder assembly 510 (1,125)

13. GENERAL WEIGHT TABLE
01-8 PC400LC-7L
Bucket cylinder assembly 280 (618)
Link assembly 258 (569)
Boom pin 92 (203) + 20 (45) x 2 + 73 (161) + 27 (60) + 54 (120)
Arm pin 17 (38) + 23 (51)
Bucket pin 38 (102) x 2
Link pin 34 (75) x 2

14. GENERAL FUEL COOLANT AND LUBRICANTS
PC400LC-7L 01-9
12
FUEL COOLANT AND LUBRICANTS
It is not our policy to approve fuel, coolant and lubricants or to guarantee performance in service. The responsibility for the
quality of the fuel, coolant and lubricant must remain with the supplier. When in doubt, consult your distributor. The specified
fuel, coolant and lubricants recommended for this machine are as shown in the following table.
★ ASTM D975 No. 1
★ ★ For the H-046-HM, use the oil recommended by Komatsu.
RESERVOIR
KIND OF
FLUID
AMBIENT TEMPERATURE CAPACITY - L (gal)
-22 -4 14 32 50 68 86 104°F
-30 -20 -10 0 10 20 30 40°C
Specified Refill
Engine oil pan 42 (11.09) 38 (10.03)
Engine
oil
SAE 30
SAE 10W
SAE 10W-30
SAE 15W-40
Damper case 1.07 (0.282) ---
Swing machinery case 13.4 (3.53)
Final drive case (each side) SAE 30 12 (3.17)
Idler (1 each) 0.335-0.355 (0.0884-0.0937)
Track roller (1 each) 0.28-0.31 (0.0739-0.0818)
Carrier roller (1 each) 0.12-0.18 (0.0317-0.0475)
Hydraulic system 472 (124.6) 248 (65.5)
SAE 10W
SAE 10W-30
SAE 15W-40
Hydraulic
oil
H046-HM (H)★★
Fuel tank
Diesel
fuel
650 (171.7) ---
ASTM D975 No. 2
★
Cooling system Coolant Add antifreeze 36 (9.51) ---

15. 10 STRUCTURE AND FUNCTION
10-1
12RADIATOR • OIL COOLER • AFTERCOOLER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-3
POWER TRAIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-4
FINAL DRIVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-5
SWING MACHINERY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-7
SWING CIRCLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-9
TRACK FRAME AND RECOIL SPRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-10
IDLER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-12
CARRIER ROLLER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-13
TRACK ROLLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-14
TRACK SHOE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-16
TRIPLE GROUSER SHOE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-19
HYDRAULIC SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20
HYDRAULIC PIPING DRAWING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20
HYDRAULIC TANK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-22
HYDRAULIC PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-24
LS VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-29
PC VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-29
LS(PS)-EPC VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-41
VARIABLE VOLUME VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-44
CONTROL VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-46
MAIN RELIEF VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-60
CLSS (CLOSED CENTER LOAD SENSING SYSTEM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-62
SELF PRESSURE REDUCING VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-65
SWING MOTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-68
RELIEF VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-72
REVERSAL PREVENTION VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-74
CENTER SWIVEL JOINT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-76
TRAVEL MOTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-77
PARKING BRAKE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-82
TRAVEL JUNCTION VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-88
CONTROL VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-90
TRAVEL PPC SHUTTLE VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-92
WORK EQUIPMENT • SWING PPC VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-95
TRAVEL PPC VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-100
SERVICE PPC VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-108
SOLENOID VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-109
PPC ACCUMULATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-111
RETURN OIL FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-112
BOOM HYDRAULIC DRIFT PREVENTION VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-114
ARM HYDRAULIC DRIFT PREVENTION VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-119
QUICK RETURN VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-123
LIFT CHECK VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-125
ATTACHMENT CIRCUIT SELECTOR VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-126
HOLDING VALVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-128
HYDRAULIC CYLINDER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-132
BOOM CYLINDER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-132
ARM CYLINDER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-132
PC400LC-7L

16. STRUCTURE AND FUNCTION TABLE OF CONTENTS
10-2 PC400LC-7L
BUCKET CYLINDER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-132
WORK EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-134
DIMENSION ARM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-136
DIMENSION OF BUCKET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-138
AIR CONDITIONER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-140
AIR CONDITIONER PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-140
ENGINE CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-141
OPERATION OF SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-141
STARTING ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-141
ENGINE SPEED CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-141
STOPPING ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-141
COMPONENTS OF SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-142
FUEL CONTROL DIAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-142
ENGINE CONTROLLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-143
ELECTRONIC CONTROL SYSTEM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-146
CONTROL FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-146
TOTAL SYSTEM DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-148
ENGINE AND PUMP CONTROL FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-150
PUMP/VALVE CONTROL FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-155
ONE-TOUCH POWER MAXIMIZING/MACHINE PUSH-UP FUNCTION . . . . . . . . . . . . . . . . . . . . . . 10-158
AUTO-DECELERATION FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-160
AUTO-WARM-UP/OVERHEAT PREVENTION FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-162
SWING CONTROL FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-164
TRAVEL CONTROL FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-166
ATT FLOW CONTROL, CIRCUIT SELECTOR FUNCTION (IF EQUIPMENT) . . . . . . . . . . . . . . . . . . 10-168
SYSTEM COMPONENT PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-169
ENGINE REVOLUTION SENSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-169
PPC OIL PRESSURE SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-170
PUMP PRESSURE SENSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-171
PUMP CONTROLLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-172
MONITOR SYSTEM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-175
MONITOR CONTROL, DISPLAY PORTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-178
MONITOR PORTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-178
MONITOR ITEMS AND DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-179
SWITCHES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-183
SELECT MODE FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-186
MAINTENANCE FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-189
SERVICE METER CHECK FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-192
DISPLAY LCD CHECK FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-192
SENSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-194
ENGINE OIL LEVER SENSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-194
ENGINE OIL PRESSURE SENSOR (FOR LOW PRESSURE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-194
COOLANT TEMPERATURE SENSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-195
HYDRAULIC OIL TEMPERATURE SENSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-195
FUEL LEVEL SENSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-195
AIR CLEANER CLOGGING SENSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-196

17. STRUCTURE AND FUNCTION RADIATOR • OIL COOLER • AFTERCOOLER
PC400LC-7L 10-3
12
RADIATOR • OIL COOLER • AFTERCOOLER
1. Oil cooler 7. Radiator inlet hose Specifications
2. Radiator 8. Radiator outlet hose Radiator: ALW-4
3. Radiator cap 9. Aftercooler Oil cooler: CF40-1
4. Reservoir tank 10. Condenser
5. Net 11. Fuel cooler
6. Shroud

18. STRUCTURE AND FUNCTION POWER TRAIN
10-4 PC400LC-7L
12
POWER TRAIN
1. Idler 7. Hydraulic pump (HPV190+190)
2. Center swivel joint 8. Travel speed solenoid valve
3. Control valve 9. Swing brake solenoid valve
4. Final drive 10. Swing machinery
5. Travel motor (KMV 200ADT-2) 11. Swing motor (KMF230ABE-5)
6. Engine (SAA6D125-3E) 12. Swing circle

19. STRUCTURE AND FUNCTION FINAL DRIVE
PC400LC-7L 10-5
12
FINAL DRIVE

20. STRUCTURE AND FUNCTION FINAL DRIVE
10-6 PC400LC-7L
12
Unit: mm
1. Level plug
2. Drain plug
3. No. 1 planetary gear (No. of teeth: 43)
4. No. 1 sun gear (No. of teeth: 10)
5. No. 2 sun gear (No. of teeth: 18)
6. No. 1 planetary carrier
7. No. 2 planetary carrier
8. Cover
9. Ring gear (No. of teeth: 98)
10. Sprocket
11. Floating seal
12. Travel motor
13. No. 2 planetary gear (No. of teeth: 38)
Specification
Reduction ratio:
-((10 + 98)/10)x((18+98)/18)=-68.600
No. Check item Criteria Remedy
14
Backlash between No. 1 sun gear and No. 1 planetary
gear
Standard clearance Clearance limit
Replace
0.15 - 0.54 1.10
15 Backlash between No. 1 planetary gear and ring gear 0.18 - 0.66 1.30
16 Backlash between No. 2 planetary carrier and motor 0.06 - 0.24 ---
17
Backlash between No. 2 sun gear and No. 2 planetary
gear
0.15 - 0.51 1.00
18 Backlash between No. 2 planetary gear and ring gear 0.17 - 0.60 1.20
19
Backlash between No. 2 planetary carrier and No. 2
sun gear 0.15 - 0.54 ---
20 Amount of wear on sprocket tooth Repair limit: 6
Rebuild or replace
21 Width of sprocket tooth
Standard size Repair limit
90 87
22 Bolt
Torque Nm Torque lbf ft
59 - 78 44 - 57
23 Bolt 98 - 123 73 - 90
24 Bolt 59 - 74 44 - 54
25 Bolt 640 - 785 473 - 578
26 Bolt 490 - 608 362 - 448

21. STRUCTURE AND FUNCTION SWING MACHINERY
PC400LC-7L 10-7
12
SWING MACHINERY

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23. STRUCTURE AND FUNCTION SWING MACHINERY
10-8 PC400LC-7L
12
Unit: mm
1. Swing pinion (No. of teeth: 13)
2. Cover
3. Case
4. No. 2 planetary gear
5. No. 2 sun gear
6. Ring gear
7. No. 1 sun gear
8. Swing motor
9. Oil level gauge
10. No. 1 planetary gear
11. No. 1 planetary carrier
12. No. 2 planetary carrier
13. Drain plug
Specification
Reduction ratio:
((19 +68)/19)x((16+68)/16)=24.039
No. Check item Criteria Remedy
14
Backlash between swing motor shaft and No. 1
sun gear
Standard clearance Clearance limit
Replace
0.18 - 0.28 ---
15
Backlash between No. 1 sun gear and No. 1
planetary gear
0.15 - 0.51 1.00
16
Backlash between No. 1 planetary gear and ring
gear
0.17 - 0.60 1.10
17
Backlash between No. 1 planetary carrier and
No. 2 sun gear
0.40 - 0.75 1.20
18
Backlash between No. 2 sun gear and No. 2
planetary gear
0.16 - 0.55 1.00
19
Backlash between No. 2 planetary gear and ring
gear
0.17 - 0.60 1.10
20 Backlash between coupling and swing pinion 0.08 - 0.25 ---
21 Backlash between swing pinion and swing circle 0.00 - 1.21 2.00
22 Clearance between plate and coupling 0.57 - 1.09 ---
23
Wear of swing pinion surface contacting with oil
seal
Standard size Repair limit Apply hard chrome
plating, recondition, or
replace150 0
-0.100 ---
24 Bolt
Torque Nm Torque lbf ft
824 - 1030 608 - 759
25 Bolt 343 - 427 253 - 314
26 Bolt 98 - 123 73 - 90
27 Bolt 245 - 309 181 - 228
28 Bolt 2.81 - 3.79 2.07 - 2.79

24. STRUCTURE AND FUNCTION SWING CIRCLE
PC400LC-7L 10-9
12
SWING CIRCLE
Unit: mm
1. Swing circle inner race (No. of teeth: 84) Specification
2. Ball Reduction ration: - 84
13
= -6.462
3. Swing circle outer race Amount of grease: 33 L (8.71 gal) {G2-LI}
a. Inner race soft zone “S” position
b. Outer race soft zone “S” position
No. Check item Criteria Remedy
4
Axial clearance of bearing (when mounted on
chassis)
Standard clearance Repair limit
Replace
0.5 - 1.6 3.2

25. STRUCTURE AND FUNCTION TRACK FRAME AND RECOIL SPRING
10-10 PC400LC-7L
12
TRACK FRAME AND RECOIL SPRING
1. Idler • The dimensions and the number of track rollers depend on the model, but the basic
structure is not different.
• Number of track rollers: 8
2. Track frame
3. Carrier roller
4. Final drive
5. Track roller
6. Track shoe
7. Center guard
8. Recoil spring
9. Front guard